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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 3,155 | $ 4,238,170 | $ 3,914,645 | $ (32,864) | $ (4,512,205) | $ 3,610,901
Balance (in shares) at Dec. 31, 2018 | 630,970 |  |  |  | (87,294) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 15,324 |  |  |  | 15,324
Exercise of stock options | $ 19 | 35,144 |  |  |  | 35,163
Exercise of stock options (in shares) | 3,871 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 120 |  | 120
Repurchase of common stock |  |  |  |  | $ (222,792) | (222,792)
Repurchase of common stock (in shares) |  |  |  |  | (4,000) |
Foreign currency translation |  |  |  | (1,381) |  | (1,381)
Net income |  |  | 261,485 |  |  | 261,485
Balance at Mar. 31, 2019 | $ 3,174 | 4,288,638 | 4,176,130 | (34,125) | $ (4,734,997) | 3,698,820
Balance (in shares) at Mar. 31, 2019 | 634,841 |  |  |  | (91,294) |
Balance at Dec. 31, 2018 | $ 3,155 | 4,238,170 | 3,914,645 | (32,864) | $ (4,512,205) | 3,610,901
Balance (in shares) at Dec. 31, 2018 | 630,970 |  |  |  | (87,294) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  |  |  | 852,881
Balance at Sep. 30, 2019 | $ 3,181 | 4,370,280 | 4,767,526 | (43,083) | $ (4,989,926) | 4,107,978
Balance (in shares) at Sep. 30, 2019 | 636,235 |  |  |  | (95,644) |
Balance at Mar. 31, 2019 | $ 3,174 | 4,288,638 | 4,176,130 | (34,125) | $ (4,734,997) | 3,698,820
Balance (in shares) at Mar. 31, 2019 | 634,841 |  |  |  | (91,294) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 15,575 |  |  |  | 15,575
Exercise of stock options | $ 6 | 45,964 |  |  |  | 45,970
Exercise of stock options (in shares) | 1,288 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 215 |  | 215
Repurchase of common stock |  |  |  |  | $ (621) | (621)
Repurchase of common stock (in shares) |  |  |  |  | (10) |
Foreign currency translation |  |  |  | 5,154 |  | 5,154
Net income |  |  | 292,473 |  |  | 292,473
Balance at Jun. 30, 2019 | $ 3,180 | 4,350,177 | 4,468,603 | (28,756) | $ (4,735,618) | 4,057,586
Balance (in shares) at Jun. 30, 2019 | 636,129 |  |  |  | (91,304) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 15,991 |  |  |  | 15,991
Exercise of stock options | $ 1 | 4,112 |  |  |  | 4,113
Exercise of stock options (in shares) | 106 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 32 |  | 32
Repurchase of common stock |  |  |  |  | $ (254,308) | (254,308)
Repurchase of common stock (in shares) |  |  |  |  | (4,340) |
Foreign currency translation |  |  |  | (14,359) |  | (14,359)
Net income |  |  | 298,923 |  |  | 298,923
Balance at Sep. 30, 2019 | $ 3,181 | 4,370,280 | 4,767,526 | (43,083) | $ (4,989,926) | 4,107,978
Balance (in shares) at Sep. 30, 2019 | 636,235 |  |  |  | (95,644) |
Balance at Dec. 31, 2019 | $ 3,182 | 4,397,511 | 5,022,480 | (32,387) | $ (5,219,505) | 4,171,281
Balance (in shares) at Dec. 31, 2019 | 636,460 |  |  |  | (99,762) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 17,098 |  |  |  | 17,098
Exercise of stock options | $ 4 | 13,971 |  |  |  | 13,975
Exercise of stock options (in shares) | 644 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 304 |  | 304
Repurchase of common stock |  |  |  |  | $ (579,948) | (579,948)
Repurchase of common stock (in shares) |  |  |  |  | (10,503) |
Foreign currency translation |  |  |  | (30,599) |  | (30,599)
Net income |  |  | 278,835 |  |  | 278,835
Balance at Mar. 31, 2020 | $ 3,186 | 4,428,580 | 5,301,315 | (62,682) | $ (5,799,453) | 3,870,946
Balance (in shares) at Mar. 31, 2020 | 637,104 |  |  |  | (110,265) |
Balance at Dec. 31, 2019 | $ 3,182 | 4,397,511 | 5,022,480 | (32,387) | $ (5,219,505) | $ 4,171,281
Balance (in shares) at Dec. 31, 2019 | 636,460 |  |  |  | (99,762) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  | 1,711
Net income |  |  |  |  |  | $ 937,858
Balance at Sep. 30, 2020 | $ 3,192 | 4,513,743 | 5,960,338 | (32,529) | $ (5,815,423) | 4,629,321
Balance (in shares) at Sep. 30, 2020 | 638,458 |  |  |  | (110,565) |
Balance at Mar. 31, 2020 | $ 3,186 | 4,428,580 | 5,301,315 | (62,682) | $ (5,799,453) | 3,870,946
Balance (in shares) at Mar. 31, 2020 | 637,104 |  |  |  | (110,265) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 15,936 |  |  |  | 15,936
Exercise of stock options | $ 4 | 29,863 |  |  |  | 29,867
Exercise of stock options (in shares) | 820 |  |  |  |  |
Unrealized gain, net on available-for-sale securities |  |  |  | 200 |  | 200
Repurchase of common stock |  |  |  |  | $ (15,822) | (15,822)
Repurchase of common stock (in shares) |  |  |  |  | (298) |
Foreign currency translation |  |  |  | 9,044 |  | 9,044
Net income |  |  | 311,369 |  |  | 311,369
Balance at Jun. 30, 2020 | $ 3,190 | 4,474,379 | 5,612,684 | (53,438) | $ (5,815,275) | 4,221,540
Balance (in shares) at Jun. 30, 2020 | 637,924 |  |  |  | (110,563) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation |  | 17,668 |  |  |  | 17,668
Exercise of stock options | $ 2 | 21,696 |  |  |  | 21,698
Exercise of stock options (in shares) | 534 |  |  |  |  |
Unrealized loss, net on available-for-sale securities |  |  |  | (308) |  | (308)
Repurchase of common stock |  |  |  |  | $ (148) | (148)
Repurchase of common stock (in shares) |  |  |  |  | (2) |
Foreign currency translation |  |  |  | 21,217 |  | 21,217
Net income |  |  | 347,654 |  |  | 347,654
Balance at Sep. 30, 2020 | $ 3,192 | $ 4,513,743 | $ 5,960,338 | $ (32,529) | $ (5,815,423) | $ 4,629,321
Balance (in shares) at Sep. 30, 2020 | 638,458 |  |  |  | (110,565) |

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